<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="../js/vue.js"></script>

</head>


<body>
    <div id="root">
        姓: <input type="text" v-model="firstName"> <br>
        名: <input type="text" v-model="lastName"> <br>
        全名: <span>{{fullName}}<span><br>
    </div>

</body>

</html>
<script>
    const vm = new Vue({
        el: '#root',
        data: {
            firstName: '张',
            lastName: '三'
        },
        computed: {

            //完整写法
            // fullName: {
            // get() {
            //     console.log('get被调用了');
            //     return this.firstName + '-' + this.lastName
            // },
            // set(value) {
            //     console.log(value);
            //     const arr = value.split('-')
            //     this.firstName = arr[0]
            //     this.lastName = arr[1]
            // }      
            // }
            //简写
            fullName() {
                console.log('get被调用了');
                return this.firstName + '-' + this.lastName
            }
        }
    })
</script>